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toarray returns an ndarray; todense returns a matrix. If you want a matrix, use todense ; otherwise, use toarray .
todense(order=None, out=None)[source] Return a dense matrix representation of this matrix. Parameters order{'C', 'F'}, optional. Whether to store multi-dimensional data in C (row-major) or Fortran (column-major) order in memory. The default is 'None', which provides no ordering guarantees.
Numpy matrices are strictly 2-dimensional, while numpy arrays (ndarrays) are N-dimensional. Matrix objects are a subclass of ndarray, so they inherit all the attributes and methods of ndarrays.
The function csr_matrix() is used to create a sparse matrix of compressed sparse row format whereas csc_matrix() is used to create a sparse matrix of compressed sparse column format.
toarray returns an ndarray; todense returns a matrix. If you want a matrix, use todense; otherwise, use toarray.
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